package com.ncmmall.application.util.code;

import com.google.zxing.common.BitMatrix;
import org.apache.commons.codec.binary.Base64;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Created by EDZ on 2018/6/22.
 */
public class MatrixToImageWriter {

    private static final int BLACK = 0xFF000000;//用于设置图案的颜色
    private static final int WHITE = 0xFFFFFFFF; //用于背景色

    private MatrixToImageWriter() {
    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, (matrix.get(x, y) ? BLACK : WHITE));
            }
        }
        return image;
    }

    public static String writeToFile(BitMatrix matrix) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", outputStream);
        image.getGraphics().dispose();
        return "data:image/jpeg;base64," + Base64.encodeBase64String(outputStream.toByteArray());
    }

    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream, String logUri) throws IOException {
        BufferedImage image = toBufferedImage(matrix);

        //设置logo图标
        QRCodeFactory logoConfig = new QRCodeFactory();
        image = logoConfig.setMatrixLogo(image, logUri);

        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }
}
